12- Treated water can be disinfected by adding ___________.
(A) Alum
(B) Fluorine
(C) Chlorine
(D) Oxygen
13- A herbivore is also known as a
(A) Producer
(B) First order consumer
(C) Second order consumer
(D) Third order consumer
14- Which out of the following is a measure to control air pollution?
(A) Reduction in use of fossil fuels
(B) Increasing use of renewable energy resources
(C) Using catalytic convertors in vehicles
(D) All of the above
15- A product of photosynthesis is ___________.
(A) Carbon dioxide
(B) Water
(C) Oxygen
(D) Chlorophyll
16- The discharge of warm/hot water directly into rivers is known as ___________.
(A) Water pollution
(B) Thermal pollution
(C) Marine pollution
(D) None of the above
17- Primary source of energy in a food web is/are ___________.
(A) Green plants
(B) Sun
(C) Inorganic nutrients
(D) Animals 248.
18- The final stable community in ecological succession is ___________.
(A) Climax
(B) Pioneer
(C) Sere
(D) Carnivores
19- A group of living organisms of the same kind living in the same place and at the same time refers to a ___________.
(A) Community
(B) Species
(C) Population
(D) Consumers
20- Mass of living matter at a trophic level in an area at any given time is called ___________.
(A) Standing state
(B) Standing crop
(C) Humus
(D) Detritus
21- Biogas contains mainly ___________.
(A) Methane
(B) Propane
(C) Butane
(D) Carbon dioxide
22- Which of these organisms has a diet consisting only of plant matter?
(A) Omnivores
(B) Carnivores
(C) Herbivores
(D) Insectivores
ANSWERS:
12-(C), 13-(B), 14-(D), 15-(C), 16-(B), 17-(B), 18-(A), 19-(C), 20-(B), 21-(A), 22-(C)